Three-phase current detection device

A three-phase current detection device configured to be used with a first conductor, a second conductor, and a third conductor which are extended in a flow direction and allow respective three-phase currents to flow therethrough in the flow direction, the three-phase current detection device being configured to detect the three-phase currents, the three-phase current detection device comprising:

• a substrate;
• a grounding wiring provided on the substrate;
• a first loop magnetic core extended along a first loop line surrounding the first conductor, the first loop line being on a plane perpendicular to the flow direction, the first loop magnetic core having conductivity, the first loop magnetic core having a first magnetic gap therein located on the first loop line;
• a second loop magnetic core extended along a second loop line surrounding the second conductor, the second loop line being on the plane, the second loop magnetic core having conductivity, the second loop magnetic core having a second magnetic gap therein located on the second loop line;
• a third loop magnetic core extended along a third loop line surrounding the third conductor, the third loop line being on the plane, the third loop magnetic core having conductivity, the third loop magnetic core having a third magnetic gap therein located on the third loop line;
• a first magnetoelectric conversion element disposed in the first magnetic gap, the first magnetoelectric conversion element being configured to convert, to an electric signal, a magnetic field generated by a current flowing in the first conductor;
• a second magnetoelectric conversion element disposed in the second magnetic gap, the second magnetoelectric conversion element being configured to convert, to an electric signal, a magnetic field generated by a current flowing in the second conductor;
• a third magnetoelectric conversion element disposed in the third magnetic gap, the third magnetoelectric conversion element being configured to convert, to an electric signal, a magnetic field generated by a current flowing in the third conductor;
• a first grounding electrode disposed on the substrate and connected to the grounding wiring, the first grounding electrode contacting the first loop magnetic core and pressing the first loop magnetic core in a first pressing direction perpendicular to the flow direction;
• a second grounding electrode disposed on the substrate and connected to the grounding wiring, the second grounding electrode contacting the second loop magnetic core and pressing the second loop magnetic core in a second pressing direction perpendicular to the flow direction;
• and
• a third grounding electrode disposed on the substrate and connected to the grounding wiring, the third grounding electrode contacting the third loop magnetic core and pressing the third loop magnetic core in a third pressing direction perpendicular to the flow direction.